import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Queue;

/**
 * @author LKQ
 * @date 2022/2/25 13:57
 * @description
 */
public class Solution2 {
    public static void main(String[] args) {
        Solution2 solution2 = new Solution2();
        solution2.findNumbers(new int[]{121});
    }
    public int findNumbers(int[] nums) {
        int sum = 0;
        for(int num: nums) {
            int cnt = (int) (Math.log10(num) + 1) ;
            if (cnt % 2 == 0) {
                sum++;
            }
        }
        return sum;
    }
}
